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P. and V. ἀλλά, δέ, Ar. and V. ἀτάρ (also Plato but rare P.).
except: P. and V. εἰ μή, πλήν (gen.).
nothing but: P. οὐδὲν ἀλλ' ἤ.
all but: P. and V. ὅσον οὔπω, P. ὅσον οὐ.
nearly: P. ὀλίγου.
but for, had it not been for: Ar. and P. εἰ μὴ διά (acc.).
we cannot but admire: P. and V. οὐκ ἔστιν ὅπως οὐ θαυμάζομεν, οὐκ ἔσθ' ὅπως οὐ θαυμάζομεν.
not but that: P. οὐ μὴν ἀλλά.