grass parakeet vs parrakeet

grass parakeet and parrakeet both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass parakeet	Yes	No	No	No
parrakeet	Yes	No	No	No

As nouns, parrakeet is a hypernym of grass parakeet; that is, parrakeet is a word with a broader meaning than grass parakeet:

grass parakeet: small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors
parrakeet: any of numerous small slender long-tailed parrots

Other hypernyms of grass parakeet include parakeet, paraquet, paroquet, parroket, parroquet.

grass parakeet (noun)	parrakeet (noun)
small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors	any of numerous small slender long-tailed parrots