There are 12 words that start with 'obtr'.
| obtrude | obtruded |
| obtruder | obtrudes |
| obtruders | obtruding |
| obtrusion | obtrusive |
| obtrusions | obtrusively |
| obtrusiveness | obtrusivenesses |
Note: These 12 words that start with 'obtr' are found from the USA & Canada version of the tournament Scrabble word list.