2 syllables: boost, ers. Stress on boost.
BOO-sturz
/ˈbustɚz/
boosters is pronounced BOO-sturz (/ˈbustɚz/). It has two syllables (boost-ers), with the stress on "boost". Boosters refers to items or strategies that increase effectiveness, energy, or support. In plural form, it generally denotes multiple agents or devices designed to amplify a desired outcome, such as vaccine boosters, dietary boosters, or boosters in engineering contexts. The term carries a practical, secular tone and is used across technical, medical, marketing, or everyday language to describe augmentative measures.
Boosters refers to items or strategies that increase effectiveness, energy, or support. In plural form, it generally denotes multiple agents or devices designed to amplify a desired outcome, such as vaccine boosters, dietary boosters, or boosters in engineering contexts. The term carries a practical, secular tone and is used across technical, medical, marketing, or everyday language to describe augmentative measures.
"The clinic recommended boosters to maintain immunity after exposure."
"We added booster seats to the plan to give parents extra support during travel."
"The recipe includes boosters like protein powder and greens to enhance nutrition."
Pronounce as /ˈbuː.stərz/ in US/UK/AU. Start with a long /uː/ as in ‘goose,’ then a casual /stər/ cluster with a rhotic or non-rhotic vowel depending on accent, ending with /z/. The stress is on the first syllable: BOO-sters. Tip: keep /st/ tightly blended and avoid separating the syllables too much in rapid speech.
Common errors include pronouncing the first syllable with a short /ʊ/ (like ‘book-ster-’), and voicing the final /z/ inconsistently. Some speakers insert an extra vowel between /st/ and /ər/ (boost-uh-rz). Correction: hold the /st/ cluster, use a clear /ə/ or schwa for /ər/, and finish with a crisp /z/ or /ɹz/ depending on accent, ensuring the second syllable isn’t swallowed.
In US and AU accents, /ˈbuː.stɚz/ with rhotic /ɚ/ for /ər/; UK often features non-rhoticity, rendering it /ˈbuː.stə.z/ with a lighter /ə/ and a terminal /z/. Australian typically follows US rhotics but may exhibit slightly shorter /uː/ and a more centralized /ə/ in the second syllable. The main difference lies in the rhotic quality of the second syllable and the duration of the vowel in /uː/.
The difficulty centers on the /ˈbuː/ onset followed by a consonant cluster /st/ and a vowel-reduced second syllable /ər/ that may blend with /z/. Non-native speakers may mispronounce the /st/ cluster, misplace stress, or shorten the long /uː/. Focusing on a strong initial /buː/, a crisp /st/, and a controlled /ə/ before the final /z/ helps achieve natural pronunciation.
A unique aspect is sustaining the /ˈbuː/ vowel before the /st/ cluster while maintaining a clean /ər/ vowel in the second syllable before the final /z/. This requires precise lip rounding and tongue height for the long /uː/ and accurate schwa-to-r color in /ər/ across accents. Practicing with minimal pairs focusing on vowel length and rhotacization strengthens accuracy.
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US: rhotic /ɚ/ in the second syllable; longer /uː/ before /st/; clearer post-vocalic voice. UK: non-rhotic /ə/ in the second syllable; lighter /rz/ ending; may reduce /uː/ slightly. AU: typically rhotic like US; more rounded /uː/ and slightly flatter /ə/; sometimes a quicker transition between /st/ and /ər/. IPA cues: US/AU /ˈbuː.tɚz/ or /ˈbuː.stəz/; UK /ˈbuː.stə z/ without rhotic /r/. Tips: keep lip rounding consistent for /uː/ and practice the /st/ cluster with the tip of the tongue touching behind upper teeth.
The word booster arises from the verb boost, meaning to lift, raise, or propel upward. Boost itself likely derives from a medieval sense of ‘shoulder’ or ‘back’ that elevated weight or power, evolving in English to mean to raise or aid in progress. The suffix -er forms a noun indicating something that causes a boost or provides support. First attested in the 17th–18th centuries in contexts of lifting or fortifying, booster as a generic term gained traction in modern English in the 19th and 20th centuries, aligning with advancements where additional support or power was required (e.g., booster engines, booster doses). The plural boosters naturally developed to refer to multiple boosting agents, devices, or measures across domains such as medicine, electronics, marketing, and consumer products. The semantic field broadened to include not only physical lifting but also motivational, immunological, and performance-enhancing contexts, cementing boosters as a versatile plural noun in contemporary usage.
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Words that rhyme with "boosters"
-ers sounds
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