What comes next in this sequence?

[ParanoidUser]

elgnairt  erauqs  nogatnep  nogaxeh  nogatpeh ???

[peterbaccaro]

These are geometric shapes where the number of sides increases and the words are reversed.

• elgnairt = triangle = 3 sides
• erauqs = square = 4 sides
• nogatnep = pentagon = 5 sides
• nogaxeh = hexagon = 6 sides
• nogatpeh = heptagon = 7 sides

There for the next in the sequence is is therefore a shape with 8 sides which is an octagon with the word then reversed:

• nogatco - octagon = 8 sides

[thuongtruong1009]

Let's reverse the letters in the next word:

elgnairt (training)
erauqs (square)
nogatnep (pentagon)
nogaxeh (hexagon)
nogatpeh (?)
The next word in the sequence, with letters reversed, would be "heptagon."