dam vs dyke

dam and dyke both are nouns.

Word	Noun	Adjective	Verb	Adverb
dam	Yes	No	Yes	No
dyke	Yes	No	Yes	No

As nouns, dam and dyke are synonyms defined as:

dam and dyke: a barrier constructed to contain the flow of water or to keep out the sea

Other synonyms of dam include dike.

dam (noun)	dyke (noun)
female parent of an animal especially domestic livestock	a barrier constructed to contain the flow of water or to keep out the sea
a barrier constructed to contain the flow of water or to keep out the sea	(slang) offensive term for a lesbian who is noticeably masculine
a metric unit of length equal to ten meters

dam (verb)	dyke (verb)
obstruct with, or as if with, a dam	enclose with a dike