stocks vs plural form

stocks and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
stocks	Yes	No	No	No
plural form	Yes	No	No	No

stocks (noun)	plural form (noun)
a former instrument of punishment consisting of a heavy timber frame with holes in which the feet (and sometimes the hands) of an offender could be locked	the form of a word that is used to denote more than one
a frame for constraining an animal while it is receiving veterinary attention or while being shod
a frame that supports a boat while it is under construction