state highway vs pike

state highway and pike both are nouns.

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

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

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

state highway (noun)	pike (noun)
a broad highway designed for high-speed traffic	any of several elongate long-snouted freshwater game and food fishes widely distributed in cooler parts of the Northern Hemisphere
	medieval weapon consisting of a spearhead attached to a long pole or pikestaff; superseded by the bayonet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