• dead ahead
• get ahead
• go ahead
• light years ahead
• streets ahead
• get up on the wrong side of the bed
• on the wrong side of the bed
• put to bed
• to bed
• best thing since sliced bread
• half a loaf is better than no bread
• white bread
• drop dead
• knock 'em dead
• stone dead
• Dead head
• acid head
• beat into one's head
• big head
• bring to a head
• eyes in the back of one's head
• fat head
• fling oneself at someone's head
• get through one's head
• go over one's head
• go to one's head
• hang one's head
• hang over one's head
• have a price on one's head
• have rocks in one's head
• heap coals of fire on one's head
• heels over head
• hide one's head
• hit the nail on the head
• in over your head
• into one's head
• keep a civil tongue in one's head
• like a bear with a sore head
• like a hole in the head
• lose one's head
• off one's head
• off the top of one's head
• over one's head
• over your head
• price on one's head
• put ideas into one's head
• rear its head
• talk out of the back of your head
• through one's head
• turn one's head
• upon one's head
• have the lead
• raise ned
• sight read
• taken as read
• in good stead
• stand in good stead
• stand one in good stead
• by a thread
• hang by a thread
• fools rush in where angels fear to tread

• pointy heads
• set of new threads

One-syllable words do not have mosaic rhymes.