subacvatic Adjective, subacvatic

1. underwater

Appox. usage (any sense): 2.52 per million words

submers Adjective, submers

1. underwater

Appox. usage (any sense): 0.015 per million words

acvanautic Adjective, acvanautic

1. related to underwater exploration

Appox. usage (any sense): less than 0.1 per million words