11-Letter Words Start with 'op'

There are 28 11-letter words that start with 'op'.

opalescence	openability	openhearted
openmouthed	operability	operagoings
operational	operatively	operculated
operettists	operoseness	ophiologies
ophthalmias	opinionated	opponencies
opportunely	opportunism	opportunist
opportunity	oppositions	oppressions
opprobrious	opprobriums	opsonifying
optionality	optokinetic	optometries
optometrist

Note: These 28 11-letter words that start with 'op' are found from the USA & Canada version of the tournament Scrabble word list.

Also see words start with ope, opp, opt, opa, opi, oph, opu, ops, opo.

3-letter words start with 'op' (3)
4-letter words start with 'op' (7)
5-letter words start with 'op' (10)
6-letter words start with 'op' (21)
7-letter words start with 'op' (37)
8-letter words start with 'op' (55)
9-letter words start with 'op' (63)
10-letter words start with 'op' (41)
11-letter words start with 'op' (28)
12-letter words start with 'op' (19)
13-letter words start with 'op' (20)
14-letter words start with 'op' (14)
15-letter words start with 'op' (13)