Similar words
gendre
Fils is your biological son; gendre is a son-in-law, gained through marriage.
Similar in other languages
German
Sohn
Sohn is the German word for the same thing — both mean "son."
Spanish
hijo
hijo is the Spanish word for the same thing — both mean "son."
Portuguese
filho
filho is the Portuguese word for the same thing — both mean "son."
Practice
1 What does fils mean?
son
2 Fill the gap: Leur ___ joue au football.
Full sentence: Leur fils joue au football. (Their son plays soccer.)
3 Which fingerprint chart matches fils?
fils: neutral register, core frequency, general domain, neutral connotation.