The Spanish word 'además' (meaning 'moreover' or 'besides') comes from combining the Spanish prefix 'a-' with the word 'demás' (meaning 'more' or 'others'). Going further back, 'demás' itself was formed from two Latin words: 'de' (meaning 'of' or 'from') and 'magis' (meaning 'more'). This combination and evolution of meaning makes sense, as 'además' is used to add additional information or points to a discussion - literally building on the concept of 'more' from its Latin roots.

A simpler and very common Spanish word that shares the same etymology is 'demás' (meaning 'others' or 'the rest'). While 'además' is used as an adverb to mean 'moreover' or 'in addition to', its relative 'demás' is used as an adjective or pronoun to refer to additional people or things. Both words carry the core concept of 'additional' or 'more' from their Latin root 'magis'.

While there aren't any common English words directly related to 'además', we can find some connections through its Latin root 'magis' (meaning 'more'). English words like 'master', 'magistrate', and 'magnificent' all trace back to this same Latin root. The connection is that 'magis' conveyed a sense of greatness or superiority, which evolved into these English words relating to power, authority, or grandeur.