fish vs rail

fish and rail both are nouns.

Word	Noun	Adjective	Verb	Adverb
fish	Yes	No	Yes	No
rail	Yes	No	Yes	No

As verbs, rail is a hyponym of fish; that is, rail is a word with a more specific, narrower meaning than fish:

Other hyponyms of fish include crab, seine, scallop, scollop, brail, angle, shrimp, net fish, shark, trawl, still-fish, prawn.

fish (noun)	rail (noun)
any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills	any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud
the flesh of fish used as food	a horizontal bar (usually of wood or metal)
	a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
	a barrier consisting of a horizontal bar and supports
	short for railway

fish (verb)	rail (verb)
catch or try to catch fish or shellfish	complain bitterly
seek indirectly	spread negative information about
	criticize severely
	fish with a handline over the rails of a boat
	lay with rails
	travel by rail or train
	separate with a railing
	convey (goods etc.) by rails
	provide with rails
	enclose with rails