sheepshearing vs shearing

sheepshearing and shearing both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheepshearing	Yes	No	No	No
shearing	Yes	No	No	No

As nouns, shearing is a hypernym of sheepshearing; that is, shearing is a word with a broader meaning than sheepshearing:

sheepshearing (noun)	shearing (noun)
act of shearing sheep	removing by cutting off or clipping
a festival held at the time sheep are normally sheared
the time or season when sheep are sheared