WordNet sense 1 (a person who drinks alcohol to excess habitually):

alcoholic, boozer, dipsomaniac, lush, alky, soaker

WordNet sense 2 (immerse briefly into a liquid so as to wet, coat, or saturate):

dip, douse, dunk, plunge

WordNet sense 3 (become drunk or drink excessively):

inebriate, soak, hit it up

WordNet sense 4 (the act of making something completely wet):

drenching, soaking, sousing

WordNet sense 5 (cover with liquid; pour liquid onto):

dowse, drench, sop