The repeating of beginning consonant sounds is called aliteration.
good
pear
A word that has the same sound as another word is called a homophone. Homophones are words that are pronounced the same but have different meanings or spellings, such as "sea" and "see."
noon deed
Plumkin is a made-up word that rhymes with pumpkin and starts with the P sound.
echo
That is called consonance or consonant alliteration. It creates a pleasing sound pattern in the sentence.
Use "a" before a word that starts with a consonant sound, and use "an" before a word that starts with a vowel sound. For example, "a cat" (pronounced as kæt) and "an apple" (pronounced as əˈpl̩). Remember that it is based on the sound, not the actual letter.
The word "apple" begins with the same sound as "at."
It is called a homophone. Homophones are words that sound the same when pronounced, but have different meanings and often different spellings.
Words that have the same sound are called "homophones", or if spelled the same, "homonyms".
That word is 'one'