milldam vs dike

milldam and dike both are nouns.

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

As nouns, dike is a hypernym of milldam; that is, dike is a word with a broader meaning than milldam:

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

Other hypernyms of milldam include dam, dyke.

milldam (noun)	dike (noun)
dam to make a millpond to provide power for a water mill	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

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