Letters that make flu
f, l, u are letters that make 'flu'
flue, flus, flub, flux are words created by adding a letter to 'flu'
1 possible definitions for 'flu'
Under this definition, flu is a noun and has the following properties:
'flu' can be a type of contagion, contagious disease, respiratory disease, respiratory illness, respiratory disorder.
Asian influenza, Asiatic flu, swine influenza, swine flu are types of 'flu'.