Sentence:  <WSD>Most</WSD> species seem to prefer a ready-made hollow such as a deserted mouse nest , a bird house , or the hole made by a woodpecker ; some show a definite liking for making their nest in moss . 
Meaning of the word marked with <WSD> tags:  the superlative of `much' that can be used with mass nouns and is usually preceded by `the'; a quantifier meaning the greatest in amount or extent or degree