overpowering, pervasive, pungent, rich, sharp, strong
There was an overpowering smell of burning rubber.

faint
distinct
distinctive, particular, unmistakable
funny, peculiar, strange, unusual
What's that funny smell?

familiar
lingering
aromatic, delectable, delicious, fragrant, fresh, lovely, nice, pleasant, sweet, wonderful
the sweet smell of roses

warm
awful, bad, disgusting, evil, foul, horrible, nasty, offensive, terrible, unpleasant, vile
acrid, nauseating, noxious, putrid, rank, sickly
An acrid smell filled the air.

damp, musty, rancid, sour, stale
the sour smell of unwashed linen

chemical, earthy, fishy, masculine, metallic, musky, smoky, spicy
burning, cooking
Cooking smells drifted up from the kitchen.

be filled with, have
The air was filled with a pervasive smell of chemicals.
The house had a musty smell after being shut up over the winter.

give off
The skunk gives off an unpleasant smell when attacked.

catch, detect, notice
As she walked into the house she detected the smell of gas.

mask
Fragrance dispensers are designed to mask unpleasant smells.

come, drift, emanate, float, waft
The smell was coming from the kitchen.
A delicious smell of freshly baked bread wafted across the lawn.

fill sth, hang in the air
The smell of death hangs in the air.

hit sb
Then the pungent smell hit us—rotting fish and seaweed.

smell from
the putrid smell from the slaughterhouse

smell of
the smell of smoke

sense of smell
Deer have a keen sense of smell.

the sights, sounds and smells of …
The sights, sounds and smells of Delhi stunned me.