There are 15 words that start with 'obso'.
| obsolete | obsolesce |
| obsoleted | obsoletes |
| obsolesced | obsolesces |
| obsoletely | obsoleting |
| obsolescent | obsolescing |
| obsolescence | obsoleteness |
| obsolescences | obsolescently |
| obsoletenesses | |
Note: These 15 words that start with 'obso' are found from the USA & Canada version of the tournament Scrabble word list.