The word 'vender' is a direct descendant of the Latin verb vendere, which itself is a contraction of venum dare, literally meaning 'to give for sale'. This core concept of offering goods in exchange for payment passed into English through legal and commercial language. The agent suffix '-er' was appended to create a noun identifying the person performing the action of selling. While 'vendor' is the more prevalent modern spelling, 'vender' preserves the direct morphological logic of the verb 'vend' combined with the common English agent-forming suffix.

Structure: vend (sell) + er (agent suffix) 'vend' originates from Latin vendere, meaning 'to sell'. The suffix '-er' is from Old English '-ere', an agent noun suffix indicating 'one who does something'.