The Spanish word "mujer" (meaning "woman") comes from the Old Spanish "mugier", which in turn derives from the Latin word "mulier" (also meaning "woman"). The evolution from Latin to modern Spanish shows a typical sound change pattern where the Latin 'l' became a 'j' sound (represented by 'g' in Old Spanish and 'j' in modern Spanish). This kind of sound change, where 'l' becomes a 'j' sound, is seen in other Spanish words that evolved from Latin.

The word "mujer" is one of the most basic and common words in Spanish vocabulary, so it's actually more likely that Spanish learners will encounter this word early and use it to help learn other, more complex words related to women or femininity, such as "mujeril" (womanly) or "mujercita" (little woman).

While English doesn't have any common words directly related to Latin "mulier", we do have some academic or technical terms that share this origin, such as "muliebrity" (womanhood or femininity), though this word is very rare. Instead, English words for "woman" come from different Germanic roots. This is a good example of how English and Spanish, despite both being Indo-European languages, often draw from different ancestral sources for their most basic vocabulary.