yellowbelly marmot vs rockchuck

yellowbelly marmot and rockchuck both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowbelly marmot	Yes	No	No	No
rockchuck	Yes	No	No	No

As nouns, yellowbelly marmot and rockchuck are synonyms defined as:

yellowbelly marmot and rockchuck: heavy-bodied yellowish-brown marmot of rocky areas of western North America

Other synonyms of yellowbelly marmot include Marmota flaviventris.

yellowbelly marmot (noun)	rockchuck (noun)
heavy-bodied yellowish-brown marmot of rocky areas of western North America	heavy-bodied yellowish-brown marmot of rocky areas of western North America