15-Letter Words End with 'ively'

There are 18 15-letter words that end with 'ively'.

authoritatively	argumentatively
collaboratively	demonstratively
commemoratively	communicatively
comprehensively	contemplatively
interrogatively	introspectively
postoperatively	reduplicatively
prefiguratively	remonstratively
retrogressively	retrospectively
unimaginatively	uninformatively

Note: These 18 15-letter words that end with 'ively' are found from the USA & Canada version of the tournament Scrabble word list.

Also see words end with tively, sively, cively, lively, aively, xively.

6-letter words end with 'ively' (1)
7-letter words end with 'ively' (1)
8-letter words end with 'ively' (5)
9-letter words end with 'ively' (16)
10-letter words end with 'ively' (37)
11-letter words end with 'ively' (76)
12-letter words end with 'ively' (79)
13-letter words end with 'ively' (69)
14-letter words end with 'ively' (31)
15-letter words end with 'ively' (18)