n. 25B6; verb
she sniffed and blew her nose : INHALE, breathe in; snuffle.
Tom sniffed the fruit : SMELL, scent, get a whiff of.
25B6; noun
she gave a loud sniff : SNUFFLE, inhalation.
a sniff of fresh air : SMELL, scent, whiff; lungful.
(informal) the first sniff of trouble : INDICATION, hint, whiff, inkling, suggestion, whisper, trace, sign, suspicion.
25A0; sniff at SCORN, disdain, hold in contempt, look down one's nose at, treat as inferior, look down on, sneer at, scoff at; informal turn one's nose up at.
25A0; sniff something out (informal) DETECT, find, discover, bring to light, track down, dig up, hunt out, ferret out, root out, uncover, unearth, run to earth/ground.