doublet
US /ˈdʌb.lət/
UK /ˈdʌb.lət/

1.
doblete
a pair of similar things, especially two similar words or forms in a language that have developed from the same original word
:
•
The words 'fragile' and 'frail' are doublets, both coming from the Latin 'fragilis'.
Las palabras 'fragile' y 'frail' son dobletes, ambas provienen del latín 'fragilis'.
•
Linguists often study doublets to understand language evolution.
Los lingüistas a menudo estudian los dobletes para entender la evolución del lenguaje.
2.
jubón
a man's short close-fitting padded jacket, worn from the 14th to the 17th centuries
:
•
The knight wore a silk doublet under his armor.
El caballero llevaba un jubón de seda debajo de su armadura.
•
Historical paintings often depict men in elaborate doublets.
Las pinturas históricas a menudo representan a hombres con jubones elaborados.