top boot vs desert boot

top boot and desert boot both are nouns.

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

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

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

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