a button (clothing) / a button (mechanical device)

a shirt / an undershirt, a vest

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

buttonhole (hole for a button)

(computing, graphical user interface) Start button

reset button

an aloha shirt

sleeveless undershirt, singlet, vest, tank top