PREFIX
re - back, again
sub - under

ROOT
aqua - water
mar - sea
pugn - fight

SUFFIX
-ant - that which
-acious - having the quality of
-ine - like related to

WORDS AND DEFINITIONS
aquamarine - blue-green in color, like sea water
marine - of or pertaining to the sea
submarine - being, living or used under water
pugnacious - having a quarrelsome or aggressive nature
repugnant - distasteful; offensive or revolting