Formants rhymes with:
informants, informants, garments, impairments, informants, procurements, requirements, retirement's, retirements, undergarments
Formants sounds like:
fahrenheit's, farmhands, fermenta's, ferments, fernandes, fernandez, fernando's, forehands, forints, formats, frantic, frantz, fremd's, fremitus, frenetic, frentz, friend's, friends, friends', fronds, front's, frontage, fronts, frontz