18 month old only has 2-3 words, should I be worried?

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DS understands a huge amount, can follow instructions, helps to dress himself, brings things to us etc I have no other worries about him at all.
But he only has 2-3 words. He’s very “chatty” he jabbers a lot and makes a wide variety of sounds and he tries to mimic words when we say them so “re” after we say “red” etc but he’s just not quite there yet

The health visitor wasn’t really interested and just said I should encourage him more but didn’t say how

Also make sure he sees your mouth. Sit on the floor with him, at his level, for a small period everyday to play.

Later on when you're teaching him a word, actually point at your mouth.

Thank you @grey12 really helpful