There are 15 words that start with 'obses'.
| obsess | obsessed |
| obsesses | obsessor |
| obsessing | obsession |
| obsessive | obsessors |
| obsessions | obsessives |
| obsessional | obsessively |
| obsessionally | obsessiveness |
| obsessivenesses | |
Note: These 15 words that start with 'obses' are found from the USA & Canada version of the tournament Scrabble word list.