ichneumon fly vs hymenopteran

ichneumon fly and hymenopteran both are nouns.

Word	Noun	Adjective	Verb	Adverb
ichneumon fly	Yes	No	No	No
hymenopteran	Yes	No	No	No

As nouns, hymenopteran is a hypernym of ichneumon fly; that is, hymenopteran is a word with a broader meaning than ichneumon fly:

ichneumon fly: hymenopterous insect that resembles a wasp and whose larvae are parasitic on caterpillars and other insect larvae
hymenopteran: insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing

Other hypernyms of ichneumon fly include hymenopter, hymenopteron, hymenopterous insect.

ichneumon fly (noun)	hymenopteran (noun)
hymenopterous insect that resembles a wasp and whose larvae are parasitic on caterpillars and other insect larvae	insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing