kebab vs souvlaki

kebab and souvlaki both are nouns.

Word	Noun	Adjective	Verb	Adverb
kebab	Yes	No	No	No
souvlaki	Yes	No	No	No

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

kebab: cubes of meat marinated and cooked on a skewer usually with vegetables
souvlaki: made of lamb

Other hyponyms of kebab include souvlakia.

kebab (noun)	souvlaki (noun)
cubes of meat marinated and cooked on a skewer usually with vegetables	made of lamb