calamus /kalˈə-məs/

1. (with cap) a genus of palms whose stems make canes or rattans
2. The hollow shaft at the base of a bird's feather, a quill (zoology)
3. The reed pen used in ancient times
4. The traditional name of the sweet flag or its aromatic root

• know-nothings
• knowns
• know one's onions
• know one's own mind
• know one's place
• know one's stuff
• knows
• know something backwards
• know something inside out
• know the ropes
• know the score
• know the time of day
• know what it is
• know what o'clock it is
• know what one is talking about
• know what's o'clock
• know what's what
• know where the shoe pinches
• know which side one's bread is buttered on
• know who's who
• knub
• knubbier
• knubbiest
• knubble
• knubbled