sniff
1. [ verb ] perceive by inhaling through the nose
Synonyms: whiff
Examples:

"sniff the perfume"

Related terms: smell sniff_out
2. [ verb ] inhale audibly through the nose
Synonyms: sniffle
Examples:

"the sick student was sniffling in the back row"

Related terms: inhale snuffle
3. [ noun ] sensing an odor by inhaling through the nose
Synonyms: snuff
Related terms: smell snuff
Similar spelling:   sniffy
  snuff
  snafu