dyke vs milldam

dyke and milldam both are nouns.

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

As nouns, milldam is a hyponym of dyke; that is, milldam is a word with a more specific, narrower meaning than dyke:

dyke: a barrier constructed to contain the flow of water or to keep out the sea
milldam: dam to make a millpond to provide power for a water mill

Other hyponyms of dyke include weir.

dyke (noun)	milldam (noun)
a barrier constructed to contain the flow of water or to keep out the sea	dam to make a millpond to provide power for a water mill
(slang) offensive term for a lesbian who is noticeably masculine

dyke (verb)	milldam (verb)
enclose with a dike