The Spanish word 'flor' meaning 'flower' comes directly from the Latin word 'flos' (also meaning 'flower'). The transformation from Latin to Spanish was straightforward, with the final 's' being dropped, which is a common pattern in the evolution from Latin to Spanish words.

There are many common Spanish words derived from 'flor', including: 'florero' (vase), 'florista' (florist), 'florecer' (to bloom), and 'florido' (flowery). The connection between these words is clear as they all relate to flowers or flowering.

English speakers can easily remember 'flor' by connecting it to several English words that share the same Latin root 'flos': 'floral' (relating to flowers), 'florist' (someone who sells flowers), 'flourish' (originally meaning 'to bloom'), and 'flora' (plants of a particular region). The 'flor-' beginning of these English words maintains a clear connection to the concept of flowers, just like the Spanish word.