sycophant vs groveller

sycophant and groveller both are nouns.

Word	Noun	Adjective	Verb	Adverb
sycophant	Yes	No	No	No
groveller	Yes	No	No	No

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

sycophant: a person who tries to please someone in order to gain a personal advantage
groveller: someone who humbles himself as a sign of respect; who behaves as if he had no self-respect

Other hyponyms of sycophant include apple polisher, bootlicker, fawner, groveler, truckler, goody-goody.

sycophant (noun)	groveller (noun)
a person who tries to please someone in order to gain a personal advantage	someone who humbles himself as a sign of respect; who behaves as if he had no self-respect