Seen on Twatter, "Some English lexical gaps."
| candor | candify | candific | candid | candible | |
| fervor | fervify | fervific | fervid | fervible | |
| horror | horrify | horrific | horrid | horrible | |
| liquor | liquefy | liquific | liquid | liquible | |
| livor | livify | livific | livid | livible | |
| lucor | lucify | lucific | lucid | lucible | |
| pallor | pallify | pallific | pallid | pallible | |
| rigor | rigify | rigific | rigid | rigible | |
| stupor | stupefy | stupific | stupid | stupible | |
| terror | terrify | terrific | terrid | terrible | |
| torpor | torpify | torpific | torpid | torpible | |
| vigor | vigify | vigific | vigid | vigible | |
| tepor | tepify | tepific | tepid | tepible |