pike vs state highway

pike and state highway both are nouns.

Word	Noun	Adjective	Verb	Adverb
pike	Yes	No	No	No
state highway	Yes	No	No	No

As nouns, pike and state highway are synonyms defined as:

Other synonyms of pike include expressway, freeway, motorway, superhighway, throughway, thruway.

pike (noun)	state highway (noun)
any of several elongate long-snouted freshwater game and food fishes widely distributed in cooler parts of the Northern Hemisphere	a broad highway designed for high-speed traffic
medieval weapon consisting of a spearhead attached to a long pole or pikestaff; superseded by the bayonet
a broad highway designed for high-speed traffic
a sharp point (as on the end of a spear)
highly valued northern freshwater fish with lean flesh