blind spot (place where the optic nerve attaches to the retina) / something overlooked, a point not noticed

once again, once more

felt

dead / one who is preoccupied with money, power, etc.

black hairy tongue

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

necessary evil

盲腸: appendix, caecum / 猛鳥: Raptores, the general term of condors, hawks, eagles - see also 猛禽類