hour
none, null
zero
Two such words are hero and zero.
Zero, and ten. Kind of oppisite?
There are four phonemes in the word "lunch": /l/, /ʌ/, /n/, /tʃ/.
The answer to the riddle "What is 4 in the morning, 3 at lunch, and 2 in the evening" is the letter "o." In the word "morning," there are four letters; in "lunch," there are three letters; and in "evening," there are two letters. Thus, it highlights the number of letters in each respective word at different times of the day.
Ziti Zulu zone == == == == zero Zeus zoot zinc zaps zips
4 letter z words: * zone * zero * zany * zebu * zest * zinc * zing * zoom * zeal
Zero
Noon
zero point zero 4ths
The answer to the riddle is the letter "o." In the word "morning," there are four letters 'o' (if counted as part of the phrase "4 in the morning"), in "lunch," there are three letters 'o' (if interpreted as part of the phrase "3 at lunch"), and in "evening," there are two letters 'o' (if interpreted as part of the phrase "2 in the evening"). Thus, it plays on the frequency of the letter 'o' during those times of day.