one-way street vs unilateralism

one-way street and unilateralism both are nouns.

Word	Noun	Adjective	Verb	Adverb
one-way street	Yes	No	No	No
unilateralism	Yes	No	No	No

As nouns, unilateralism is a hypernym of one-way street; that is, unilateralism is a word with a broader meaning than one-way street:

one-way street: unilateral interaction
unilateralism: the doctrine that nations should conduct their foreign affairs individualistically without the advice or involvement of other nations

one-way street (noun)	unilateralism (noun)
a street on which vehicular traffic is allowed to move in only one direction	the doctrine that nations should conduct their foreign affairs individualistically without the advice or involvement of other nations
unilateral interaction