claimant vs Pretender

claimant and Pretender both are nouns.

Word	Noun	Adjective	Verb	Adverb
claimant	Yes	No	No	No
Pretender	Yes	No	No	No

As nouns, Pretender is a hyponym of claimant; that is, Pretender is a word with a more specific, narrower meaning than claimant:

claimant: someone who claims a benefit or right or title
Pretender: a claimant to the throne or to the office of ruler (usually without just title)

claimant (noun)	Pretender (noun)
someone who claims a benefit or right or title	a claimant to the throne or to the office of ruler (usually without just title)