Junior high school English: distinguishing nouns and adjectives about weather

Generally, words with y are adjectives, and words without y are nouns

rain is a noun, rainy is an adjective

snow snowy

cloud cloudy

wind windy

Wait

Are there any with ly? I don’t remember it

But there are some that require doubling the last consonant

For example, sun and sunny

The one you mentioned is the one with ly. Isn’t it just double-writing l and then adding y? This may make people mistakenly think that it is adding ly

At least that’s what I think