Question

1.the sweet and delicious it is noun phrases or adjective noun
2. new and big car it is noun phrases or adjective noun​

Answer 1

sweet (adjective) sweet (noun) sweet–and–sour (adjective) sweet–talk (verb) sweet corn (noun)

detailed above, 'new' can be an adjective, an adverb or a noun. Adjective usage: This is a new scratch on my car! Adjective usage: The band just released a new album.