confuzzling puzzling possi and fossi

ok so this whole thing starts with me saying "possi". so heres what happened: We were coming in from recess when i decided to say "possi". so i said it. then my friend said "fossi". i asked her what a fossi was, and she said it was Chinese for, "Green dragon". i said that possi was a better word than fossi. she disagreed. so we argued about it for a long time until i finally said; ok. i like the WORD, the PRONUNCIATION, of the word possi better, but the MEANING of the word fossi better. she got my point, but she still thought that fossi was a better word. then i made up, "fossum", the plural of "fossi". so now there is ONE fossi rampaging though my house burning everything, and there are several fossUM rampaging through my friend who i disagreed with's house buring up everything (lol i don't want her house burned to the ground jk jk!) so now some of my fav words are: possum (singular), possi (plural), fossi (singular), and fossum (plural). so there is the story of possi and fossi. plz take the possi/ fossi poll.