home base vs plural

home base and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
home base	Yes	No	No	No
plural	Yes	Yes	No	No

home base (noun)	plural (noun)
(usually plural) the office that serves as the administrative center of an enterprise	the form of a word that is used to denote more than one
(baseball) base consisting of a rubber slab where the batter stands; it must be touched by a base runner in order to score

home base (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind