COIN TOSS
Credit: NY Times Crossword - Jan. 4, 1981
Nancy A. Wood  (adapted)

The four groups of words below are either TAIL HEADS, HEAD TAILS, HEAD HEADS, or TAIL TAILS. For example, given the clue word FISH, it would be a HEAD TAIL, because FISH heads, or comes before TAIL, as in FISHTAIL.The clue word LINE would be a TAIL HEAD, because it tails, or follows HEAD, as in HEADLINE. Can you put each list into the right category and determine the corresponding words?  (Note: One of the words fits into two categories.)

GROUP I     GROUP II    GROUP III     GROUP IV   
Block            Pig                Start               Spin
Egg               Pony             Wind              Pipe                     
Bobble          Fan               Waters            Wind
Talking                               Way               Feather

Answers:

GROUP I -HEAD HEADS
Blockhead
Egghead
Bobble head
Talking head

GROUP II - HEAD TAILS
Pigtail
Ponytail
Fantail

GROUP III - TAIL HEADS
Headstart
Headwind
Headwaters
Headway

GROUP IV - TAIL TAILS
Tailspin
Tailpipe
Tailwind
Tail feather