Recommended by MARCOS MOREIRA
"LOSE" and "LOOSE"
"Lose" means to fail to win or misplace. "Loose" means not tight or free. Ex.: I don't want to lose my keys. The button on my shirt is loose.
"ALTOGETHER" and "ALL TOGETHER"
"Altogether" means completely or in total. "All together" means everyone or everything in a group. Ex.: The project was altogether successful. We sang the song all together.