jackboot vs Wellington boot

jackboot and Wellington boot both are nouns.

Word	Noun	Adjective	Verb	Adverb
jackboot	Yes	No	No	No
Wellington boot	Yes	No	No	No

As nouns, jackboot and Wellington boot are synonyms defined as:

Other synonyms of jackboot include hessian, Hessian boot, Wellington.

jackboot (noun)	Wellington boot (noun)
(19th century) a man's high tasseled boot	(19th century) a man's high tasseled boot