firs - foam
- first coat
- first coat of plaster
- first cost
- first gear; first speed
- first instal(l)ment
- first level address
- first quarter
- first tap
- first-aid
- first-aid box / kit
- first-kind level; first-order level
- first-rate
- firth
- fiscal balance
- fiscal year
- fish bellied bar
- fish bolt
- fishing
- fishing piece / plate; fishplate
- fishing snake / wire
