| Subject | English | Spanish |
| food.ind. | bitter chocolate | chocolate amargo |
| nat.sc., agric. | bitter cucumber | pepinillo del diablo (Momordica charantia) |
| nat.sc., agric. | bitter cucumber | cohombrillo (Momordica charantia) |
| agric. | bitter cucumber | pepinillo del díablo (Momordica charantia) |
| transp., nautic., fish.farm. | bitter end | bitadura |
| nat.sc., agric. | bitter gourd | cohombrillo (Momordica charantia) |
| nat.sc., agric. | bitter gourd | pepinillo del diablo (Momordica charantia) |
| agric. | bitter hops | lúpulo amargo |
| nat.sc., agric. | bitter oak | Roble turco (Quercus cerris) |
| nat.sc., agric. | bitter oak | roble cerris (Quercus cerris) |
| nat.sc., agric. | bitter oak | roble cabelludo (Quercus cerris) |
| agric. | bitter orange | naranja amarga |
| agric. | bitter orange | naranja agria |
| agric. | bitter orange tree | naranjo amargo (Citrus aurantium) |
| agric. | bitter orange tree | naranjo agrio (Citrus aurantium) |
| nat.sc., agric. | bitter pit | enfermedad suberosa |
| med. | bitter plant poison | alcaloide |
| gen. | bitter plant poison | sustancia vegetal básica |
| el. | Bitter solenoid | bobina de Bitter |
| chem. | bitter spar | magnesita |
| chem. | bitter spar | dolomia |
| nat.sc., agric. | bitter vetch | alcaruna (Ervum ervilia, Vicia ervilia) |
| agric. | bitter vetch | alcaruña (Ervum ervilia, Vicia ervilia) |
| brew. | hop bitter | amargor del lúpulo |
| gen. | The smaller leaves of turnip greens are the least bitter | Las hojas mas pequeñas de los nabos silvestres son las menos amargas |