It does not rhyme but maybe "taut".
Lemon Tart?
heart part tart
tart
Tart Dog
Cart Start Tart Art
Wow! a purple tart!
chart, dart, fart, mart, cart, part, tart
Tight Wife
mite
Bart, mart, cart, dart, art, part, tart, start, heart
Tight Mc'ing
Tight throat whisperin