shish kebab vs souvlaki

shish kebab and souvlaki both are nouns.

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

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

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

Other hyponyms of shish kebab include souvlakia.

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