The Spanish word 'pájara' (meaning 'female bird') comes from the masculine form 'pájaro' ('bird') combined with the feminine suffix '-a'. 'Pájaro' itself evolved from the Vulgar Latin word 'passar' (meaning 'bird'), which in turn came from Classical Latin 'passer' (meaning 'sparrow'). Over time, the meaning broadened from specifically referring to sparrows to encompassing all birds in general.

The most common related Spanish word is 'pájaro' (bird), which is simply the masculine form of 'pájara'. This is a very common word that you'll encounter frequently in Spanish. You might also see the diminutive form 'pajarito' (little bird).

While English doesn't have any common words directly related to 'pájara', there are some scientific terms that share the Latin root 'passer'. For example, Passerine (relating to or denoting birds of a large order that includes most perching birds) comes from the same Latin word 'passer'. The house sparrow's scientific name is also 'Passer domesticus', reflecting this ancient connection.