Should we use as or like in the following context?

That sounds .......... the rain coming now.

I would be grateful if you could explain the reason for your choice.

Thank you very much
like. The verb phrase is 'sound like'.

It looks like rainclouds are forming over there.

It sounds like you're angry.

It feels like I've been run over by a water buffalo.

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Thank you Mister Micawber.

Which part of speech is like in the above mentioned phrases?

Is it preposition?

It's a preposition in 'It looks like rain' and it's a conjunction in 'It looks like it's going to rain'. That's why it's better to think of 'look like' as a phrasal verb.