muskus grass vs heron's bill

muskus grass and heron's bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
muskus grass	Yes	No	No	No
heron's bill	Yes	No	No	No

As nouns, heron's bill is a hypernym of muskus grass; that is, heron's bill is a word with a broader meaning than muskus grass:

muskus grass: low annual European herb naturalized in America; similar to alfilaria
heron's bill: any of various plants of the genus Erodium

Other hypernyms of muskus grass include storksbill.

muskus grass (noun)	heron's bill (noun)
low annual European herb naturalized in America; similar to alfilaria	any of various plants of the genus Erodium