There are 18 words that start with 'isob'.
| isobar | isobare | isobars |
| isobath | isobares | isobaric |
| isobaths | isobutyl | isobarism |
| isobathic | isobutane | isobutene |
| isobutyls | isobarisms | isobutanes |
| isobutenes | isobutylene | isobutylenes |
Note: These 18 words that start with 'isob' are found from the USA & Canada version of the tournament Scrabble word list.