Is the first syllable stressed in applause?

The Word "applause" is a verb, i.e. to applaud. It is an action Word. A consonant, on the other hand, is a single letter- in the English alphabet, it is any letter that is not a vowel (A E I O U). The other 21 letters of the alphabet are consonants. "Applause" is a Word, therefore it cannot be a consonant.