half boot vs top boot

half boot and top boot both are nouns.

Word	Noun	Adjective	Verb	Adverb
half boot	Yes	No	No	No
top boot	Yes	No	No	No

As nouns, half boot and top boot are synonyms defined as:

Other synonyms of half boot include buskin, combat boot, desert boot.

half boot (noun)	top boot (noun)
a boot reaching halfway up to the knee	a boot reaching halfway up to the knee