Some words beginning with 'sub' are:
Submarine, submit, substitute.
Some words that start with "sub" include submerge, submarine, and subculture.
Prefixes. They are added to the beginning of a word to modify its meaning.
Some words beginning with "xi" include xiphoid, xiphosuran, and xiphias.
The article "an" is used before words beginning with a vowel sound.
Submarine, subscribe, suburb, subject.
Subjugate
Some words with the prefix sub are: Submarine, Subterranean, Subtext, Subtract, Submerge.
Words beginning with 'dec' are:decadedecalDecemberdecidedecibeldecimaldecimatedeclaredecodedecreasedecrepitdecry
submarine.
Submarine, subscribe, suburb, subject.
substitute
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subcommitteesubconscioussubcontractsubdividesubduesubjectsubjectivelysubleasesubmarinesubmergesubmissionsubmitsubordinatesubscribesubscriptionsubsequentsubsetsubstancesubstandardsubstantialsubsistsubtotalsuburbsubway
Some words that start with "sub" include submerge, submarine, and subculture.
Sub rosa
Words beginning with you are limited to forms of you, youth and young. If you mean "Happy words beginning with a U sound," perhaps you refer to euphoric.
A very low interest rate at the beginning of the term.