highway vs pike

highway and pike both are nouns.

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

As nouns, pike is a hyponym of highway; that is, pike is a word with a more specific, narrower meaning than highway:

highway (noun)	pike (noun)
a major road for any form of motor transport	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	medieval weapon consisting of a spearhead attached to a long pole or pikestaff; superseded by the bayonet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