| crevice(noun, deep, gulf, chasm, abyss) |
| cross-examination(noun, study, disquisition, delving, examen) |
| delving(noun, study, disquisition, examen) |
| depths(noun, form, study, science, field) |
| diagnosis(noun, study, disquisition, delving, examen) |
| disquisition(noun, study, delving, examen) |
| emptiness(noun, deep, gulf, chasm, abyss) |
| examen(noun, study, disquisition, delving) |
| examination(noun, study, disquisition, delving, examen) |
| expanse(noun, deep, gulf, chasm, abyss) |
| exploration(noun, study, disquisition, delving, examen) |
| extent(noun, deep, gulf, chasm, abyss) |
| feeler(noun, study, disquisition, delving, examen) |
| fissure(noun, deep, gulf, chasm, abyss) |
| going-over(noun, study, disquisition, delving, examen) |
| grilling(noun, study, disquisition, delving, examen) |
| gulf(noun, deep, chasm, abyss, abysm) |
| hearing(noun, study, disquisition, delving, examen) |
| hole(noun, deep, gulf, chasm, abyss) |
| hollow(noun, deep, gulf, chasm, abyss) |