Going from English to Vietnamese (TiαΊΏng Viα»t) has a composite linguistic distance of 66% (curated lexical data). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Latin β Latin
Indo-European β Austroasiatic
The 5 languages with the lowest linguistic distance from English:
A quick 3-question check between English and Vietnamese. No signup.