sphecoid vs mud dauber

sphecoid and mud dauber both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphecoid	Yes	No	No	No
mud dauber	Yes	No	No	No

As nouns, mud dauber is a hyponym of sphecoid; that is, mud dauber is a word with a more specific, narrower meaning than sphecoid:

sphecoid: any of various solitary wasps
mud dauber: wasp that constructs mud cells on a solid base in which females place eggs laid in paralyzed insect larvae

Other hyponyms of sphecoid include mason wasp, digger wasp.

sphecoid (noun)	mud dauber (noun)
any of various solitary wasps	wasp that constructs mud cells on a solid base in which females place eggs laid in paralyzed insect larvae