keyhole
ABBA, the Band, Hole
hole
The answer is the number "two." The riddle is describing the number of letters in each word: "two" has three letters, "four" has four letters, "six" has three letters, "eight" has five letters.
pore
a hole door
Hole Cave
golf
Hole. Adit
core, bore, hole,
room, hole, unit, ring
Samuel Reynolds Hole has written: 'The letters of Samuel Reynolds Hole, Dean of Rochester' 'The letters ..'
The game of Life