| Word | Reading | Meaning | Level |
|---|
| 固い | かたい | hard, firm | N4 |
| 固定 | こてい | fixing in place, securing | N4 |
| 凝固 | ぎょうこ | solidification, hardening | N3 |
| 確固 | かっこ | firm, unshakeable | N3 |
| 固唾 | かたず | breath (held in suspense) | N3 |
| 固守 | こしゅ | clinging (to a position) | N2 |
| 確固たる | かっこたる | resolute, firm, steady | N1 |
| 断固たる | だんこたる | firm, resolute | N1 |
| 乾固 | かんこ | curing through humidity | N1 |
| 表面凝固 | ひょうめんぎょうこ | surface protein coagulation, searing | N1 |
| 固有種 | こゆうしゅ | endemic native plant species | N1 |
| 固有菌株 | こゆうきんしゅ | unique endemic microbial strain | N1 |
| 漆固め | うるしがため | sealing structural porous fissures with raw sap | N1 |
| 固有変種 | こゆうへんしゅ | unique localized botanical sub-variety | N1 |
