The Spanish word 'ladrador' meaning 'barker' comes from the Latin word 'latrator' (meaning 'barker'), which itself derives from the Latin verb 'latrare' meaning 'to bark'. The Spanish word was formed by combining the verb 'ladrar' ('to bark') with the agent suffix '-dor', which is used to create nouns that describe someone or something that performs an action. This formation pattern is similar to how English adds '-er' to verbs to create agent nouns (like 'teach' → 'teacher').

The change from Latin 'latrare' to Spanish 'ladrar' shows a common sound change where the 't' between vowels became voiced to 'd' as Latin evolved into Spanish. This is a regular sound change that occurred in many Spanish words derived from Latin.

The most obvious related Spanish word is the verb 'ladrar' meaning 'to bark', which is simpler and more commonly used than 'ladrador'. You might hear 'El perro ladra' meaning 'The dog barks'. Understanding this connection helps remember that 'ladrador' is simply 'one who barks'.

The suffix '-dor' is very productive in Spanish and appears in many common words like 'trabajador' (worker), 'jugador' (player), and 'vendedor' (seller), all following the same pattern of describing someone who performs an action.

While there aren't many common English words directly related to 'ladrador', there is an interesting connection to some rare or archaic English words. The word 'latrate' (to bark) and 'latration' (barking) are very uncommon English words that come from the same Latin root 'latrare'. However, these words are so rare that they're mainly found in very formal or archaic contexts.

Instead of focusing on these uncommon cognates, English speakers might find it more helpful to think of 'ladrador' as parallel to English words ending in '-er' that describe someone or something performing an action, like 'barker' which would be its direct translation.