13-Letter Words End with 'th'

There are 5 13-letter words that end with 'th'.

platyhelminth	quadrillionth
quintillionth	superstrength
understrength

Note: These 5 13-letter words that end with 'th' are found from the USA & Canada version of the tournament Scrabble word list.

Also see words end with oth, ith, ath, nth, uth, eth, rth, wth, dth, lth, gth, hth, fth, yth, mth, pth, sth, xth.

3-letter words end with 'th' (2)
4-letter words end with 'th' (24)
5-letter words end with 'th' (62)
6-letter words end with 'th' (36)
7-letter words end with 'th' (44)
8-letter words end with 'th' (71)
9-letter words end with 'th' (80)
10-letter words end with 'th' (37)
11-letter words end with 'th' (19)
12-letter words end with 'th' (6)
13-letter words end with 'th' (5)
15-letter words end with 'th' (1)