pike vs muskellunge

pike and muskellunge both are nouns.

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

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

pike: any of several elongate long-snouted freshwater game and food fishes widely distributed in cooler parts of the Northern Hemisphere
muskellunge: large (60 to 80 pounds) sport fish of North America

Other hyponyms of pike include Esox lucius, northern pike, Esox masquinongy, pickerel.

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

Other hyponyms of pike include pickerel.

pike (noun)	muskellunge (noun)
any of several elongate long-snouted freshwater game and food fishes widely distributed in cooler parts of the Northern Hemisphere	large (60 to 80 pounds) sport fish of North America
medieval weapon consisting of a spearhead attached to a long pole or pikestaff; superseded by the bayonet	flesh of very large North American pike; a game fish
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