daddy longlegs vs harvestman

daddy longlegs and harvestman both are nouns.

Word	Noun	Adjective	Verb	Adverb
daddy longlegs	Yes	No	No	No
harvestman	Yes	No	No	No

As nouns, daddy longlegs and harvestman are synonyms defined as:

daddy longlegs and harvestman: spiderlike arachnid with a small rounded body and very long thin legs

Other synonyms of daddy longlegs include Phalangium opilio.

daddy longlegs (noun)	harvestman (noun)
long-legged slender flies that resemble large mosquitoes but do not bite	spiderlike arachnid with a small rounded body and very long thin legs
spiderlike arachnid with a small rounded body and very long thin legs