Accept is a verb. To accept something is to agree to receive the object or action. You may accept the actions of others by giving approval or not objecting to them. The adverb form is acceptingly, and the noun form is acceptingness. They are rarely used.
Except can be a preposition, conjunction, or a verb. In all forms the general meaning is to exclude, leave out, or be outside of a group or set. The adjective form is exceptive. The preposition and conjunction forms may be except or excepting.
The confusion of these words comes with pronunciation. Accepted pronunciation of accept includes \ak, ik, or ek\ for the first vowel sound.