acrocarpous moss vs moss

acrocarpous moss and moss both are nouns.

Word	Noun	Adjective	Verb	Adverb
acrocarpous moss	Yes	No	No	No
moss	Yes	No	No	No

As nouns, moss is a hypernym of acrocarpous moss; that is, moss is a word with a broader meaning than acrocarpous moss:

acrocarpous moss: a moss in which the main axis is terminated by the archegonium (and hence the capsule)
moss: tiny leafy-stemmed flowerless plants

acrocarpous moss (noun)	moss (noun)
a moss in which the main axis is terminated by the archegonium (and hence the capsule)	tiny leafy-stemmed flowerless plants