6 letter word: A E P S X E

3 letter words
Ape
Asp
Axe
Pas - plural of "pa" - father. Two pas
Pea
Pee
Sap
Sax
Sea
See
Sex
Spa

4 letter words
Apes
Apex
Apse
Axes
Ease
Exes
Peas
Pees
Seep

5 letter word
Pease - archaic English for "peas"

6 letter word
Apexes