tooth

(literary) sharp weapon / (literary) elite; pick

(literary) keen

sharp

sharp; pointed; acute; keen

sharp (of a blade etc.) / pointed, penetrating (question etc.) / sharp, perceptive

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

dog; canine / one who is loyal (like a dog) / a spy

(not of a person) old, aged, antiquated

age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)