The Spanish word 'salsera' (meaning 'sauce boat' or 'gravy boat') comes from combining the Spanish word 'salsa' (meaning 'sauce') with the feminine noun suffix '-era'. The word 'salsa' itself can be traced back to Latin 'salsa', which was the feminine form of the word meaning 'salted', derived from the Latin verb 'sallere' meaning 'to salt'. Over time, the meaning evolved from referring to salted things to referring to sauce more generally in Spanish.

The most obvious related Spanish word is 'salsa', which simply means 'sauce'. This is a very common word that you'll encounter frequently in Spanish, both in cooking contexts and in reference to the popular dance music genre. The '-era' suffix in Spanish is also very productive and appears in many words referring to containers or people who work with something, like 'azucarera' (sugar bowl) or 'camarera' (waitress).

While English doesn't have many direct cognates from this Latin root in common usage, we have borrowed the Spanish word 'salsa' itself, both referring to the sauce and the music style. The English word 'salt' is actually related, but comes from a different Germanic root rather than the Latin one. However, we do have some more formal English words from this Latin root, like 'saline' (relating to salt) and 'salinity' (saltiness).