| Subject | English | Spanish |
| agric. | black alder | alno (Alnus glutinosa) |
| nat.sc., agric. | black anthonomus | picudo (Anthonomus rubi) |
| fish.farm. | black bullhead | bagre (Ameiurus melas, Ictalurus melas) |
| health., nat.res. | black caraway | neguilla (Nigella sativa) |
| nat.sc., agric. | black cardinalfish | tomás (Epigonus telescopus) |
| fish.farm. | black centrina | negrita (Etmopterus spinax, Spinax niger) |
| fish.farm. | black centrina | negra (Etmopterus spinax, Spinax niger) |
| fish.farm. | black centrina | negrito (Etmopterus spinax, Spinax niger) |
| fish.farm. | black centrina | cochino (Etmopterus spinax, Spinax niger) |
| nat.sc., agric. | black cherry | capulí (Prunus serotina) |
| health., nat.res. | black cohosh | cimicifuga (Cimicifuga racemosa, Cimicifuga serpentaria, Marcrotys racemosa) |
| health., nat.res. | black cumin | neguilla (Nigella sativa) |
| nat.res., agric., food.ind. | black-currant | casís |
| agric. | black currant | casis |
| chem. | black cutch | cachú |
| agric. | black earth | mantillo |
| fish.farm. | black-goby | lorcha (Gobius jozo, Gobius niger jozo, Gobius niger(Linnaeus,1758)) |
| fish.farm. | black goby | chaparrudo (Gobius jozo, Gobius niger, Gobius niger jozo) |
| fish.farm. | black-goby | chaparrudo (Gobius jozo, Gobius niger jozo, Gobius niger(Linnaeus,1758)) |
| fish.farm. | black goby | lorcha (Gobius jozo, Gobius niger jozo, Gobius niger(Linnaeus,1758)) |
| commun., IT | black hat | intruso |
| health. | black heads | espinillas |
| agric. | black horse | oscuro |
| environ. | black ice | hielo |
| econ. | black knight | tiburón |
| nat.sc., agric. | black larch | tamarack (Larix americana, Larix laricina) |
| forestr. | black locust | robinia (Robinia frisia, Robinia pseudoacacia) |
| med. | black lung | antracosis |
| nat.sc., agric. | black medic | lupulina (Medicago lupulina L., Medicago lupulina) |
| nat.sc. | black medick | lupulina (Medicago lupulina) |
| agric. | black mould | negrilla (Apiosporium ssp.) |
| agric. | black nightshade | tomatillos (Solanum nigrum) |
| mech.eng. | black nut | contratuerca |
| nat.sc., agric. | black oak | quercitrón (Quercus tinctoria, Quercus velutina) |
| nat.sc., agric. | black oat | afreita (Avena strigosa Schreb.) |
| gen. | black olive | aceituna |
| gen. | black olive | oliva |
| gen. | black olive | acebuche |
| el. | black-out | supresión |
| el. | black-out | borrado |
| med. | black phthisis | antracosis (phtisis melanotica) |
| nat.sc., agric. | black pomfret | makulu (Formio niger, Parastromateus niger) |
| forestr. | black poplar | chopo (Populus nigra) |
| food.ind. | black pudding | morcilla charcutería |
| food.ind. | black pudding blood sausage | morcilla charcutería |
| agric. | Black salsify | escorzonera (Scorzonera hispanica) |
| fish.farm. | black scabbardfish | sable (Aphanopus carbo) |
| nat.res., fish.farm. | black scabbardfish | espadilla (Aphanopus carbo) |
| nat.sc., agric. | black scorpionfish | rascacio (Scorpaena porcus) |
| fish.farm. | black shark | carocho |
| med. | black spit | antracosis |
| agric. | black spot | antracnosis |
| agric. | black spot | deformante |
| agric. | black spot | maculada |
| agric. | black spot | punteada |
| industr., construct. | black staining | grisalla |
| market., insur. | black stuff | opio |
| gen. | black tie | smoking |
| gen. | black tie | etiqueta |
| gen. | black tongue | pelagra |
| health. | black tongue | glosofitia |
| gen. | black tongue | maidismo |
| nat.sc., agric. | black vine weevil | escarbajito de la vid (Otiorrhynchus sulcatus) |
| nat.res., agric. | black walnut | tocte (Juglans nigra) |
| agric. | black wheat | alforfón |
| radio | blacker than black | infranegro |
| commun., el. | blacker-than-black | infranegro |
| radioloc. | blacker-than-black level | nivel más allá del negro |
| tech. | blacker-than-black level | nivel ultranegro |