The Spanish word 'almohada' (meaning 'pillow') comes from Hispano-Arabic 'almuẖádda', which in turn derives from Classical Arabic 'miẖaddah', also meaning 'pillow'. This is one of many Spanish words that begins with 'al-', which was the Arabic definite article (similar to 'the' in English). The word underwent some phonetic changes as it moved from Arabic into Spanish, but maintained its meaning of 'pillow' throughout its history.

While there aren't many common Spanish words directly related to 'almohada', it's worth noting that several other Spanish household terms also came from Arabic and begin with 'al-', such as 'alfombra' (carpet) and 'alcoba' (bedroom). This reflects the strong influence of Arabic culture on medieval Spanish domestic life.

There aren't any common English words directly related to 'almohada', as it comes from Arabic rather than the Latin or Germanic roots that gave rise to most English vocabulary. English speakers might find it helpful to remember that the 'al-' prefix in 'almohada' is like the word 'the' in English, as this pattern appears in many Spanish words borrowed from Arabic.