The Spanish word 'rojizo' (meaning 'reddish') comes from combining two elements: the Spanish word 'rojo' (meaning 'red') and the suffix '-izo' (which indicates similarity or resemblance). The word 'rojo' itself derives from the Latin word 'russus', meaning 'red'. The suffix '-izo' is added to create an adjective that describes something that has a quality similar to or resembling red, hence 'reddish'.

The most obvious related Spanish word is 'rojo' meaning 'red', which is simpler and more commonly used than 'rojizo'. While 'rojo' refers to the pure color red, 'rojizo' describes things that are reddish or somewhat red in color. You might also encounter other words with the same root like 'enrojecer' (to redden) or 'rojez' (redness).

While not directly related to 'rojizo', English has some words that share a distant connection through the concept of redness. The word 'russet', meaning reddish-brown, comes from the same Latin root 'russus'. This can be seen in descriptions of russet potatoes or russet-colored autumn leaves. The word 'rouge', borrowed from French but commonly used in English for red makeup, is also distantly related as it comes from Latin 'rubeus', which is related to 'russus'.