dam vs metric linear unit

dam and metric linear unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
dam	Yes	No	Yes	No
metric linear unit	Yes	No	No	No

As nouns, metric linear unit is a hypernym of dam; that is, metric linear unit is a word with a broader meaning than dam:

dam (noun)	metric linear unit (noun)
female parent of an animal especially domestic livestock	a linear unit of distance in metric terms
a barrier constructed to contain the flow of water or to keep out the sea
a metric unit of length equal to ten meters

dam (verb)	metric linear unit (verb)
obstruct with, or as if with, a dam