15-Letter Words Start with 'ost'

There are 2 15-letter words that start with 'ost'.

osteomyelitises	osteopathically

Note: These 2 15-letter words that start with 'ost' are found from the USA & Canada version of the tournament Scrabble word list.

Also see words start with oste, ostr, osti, osto, ostl, ostm.

5-letter words start with 'ost' (1)
6-letter words start with 'ost' (4)
7-letter words start with 'ost' (11)
8-letter words start with 'ost' (16)
9-letter words start with 'ost' (18)
10-letter words start with 'ost' (18)
11-letter words start with 'ost' (15)
12-letter words start with 'ost' (16)
13-letter words start with 'ost' (4)
14-letter words start with 'ost' (4)
15-letter words start with 'ost' (2)