Duty has four letters and starts with a D, and ends with a Y.
One possibility is "mixed company".
A word that starts with y and ends with y is yay .
CandyCarryCrazyCassyCatty
Yodel
accessoryanimosityastrologyastronomybiographyblasphemycuriosityfrequencygleefullycurrentlydexteritydormitoryemergencyendlesslyentomologyetymologyfactuallyhopefullyhurriedlyhusbandryinfirmaryinstantlymatrimonyperfectlyplayfullypresentlyprofanityregularlystupidityterritoryvasectomySee the related link for a full list of words.
Amy Adams.
Duty has four letters and starts with a D, and ends with a Y.
Acceptability, admissibility and affordability begin with a and end with y. Applicability, assignability and attainability begin with a and end with y.
naughty boy
letters begins withf and y and if ends with letter m
One possibility is "mixed company".
Daylily
There are words that end with z and begin with most letters. However, there are no words in the English language that begin with y and end with z.
A word that starts with y and ends with y is yay .
Anomaly, anarchy, anybody
gravy, jelly