boo vs hoot

boo and hoot both are nouns.

Word	Noun	Adjective	Verb	Adverb
boo	Yes	No	Yes	No
hoot	Yes	No	Yes	No

As nouns, boo and hoot are synonyms defined as:

Other synonyms of boo include bird, Bronx cheer, hiss, raspberry, razz, razzing, snort.

boo (noun)	hoot (noun)
a cry or noise made to express displeasure or contempt	something of little value
	a loud raucous cry (as of an owl)
	a cry or noise made to express displeasure or contempt

boo (verb)	hoot (verb)
show displeasure, as after a performance or speech	to utter a loud clamorous shout
	utter the characteristic sound of owls