I am not familiar with the "Rise of the Ancient Mariner," so I hope you mean, "The Rime of the Ancient Mariner" by Samuel Taylor Cooleridge. In his poem, Coleridge uses internal rhyme, or middle rhyme, which is a rhyme which occurs within a single line of poetry. Rhyming in or at the ends of lines is a strategic choice for the author."The Wedding-Guest here beat his breast," and "The Wedding-Guest he beat his breast," seem significant examples of internal rhyme since the lines are almost identical, but not quite. Coleridge chose to write them with slight variations. "It cracked and growled, and roared and howled," is another example of internal rhyme as well as personification.
Alliteration is the repetition of a consonant sound at the beginning of words.This sound technique is used so that writers can place emphasis on certain words. It also creates the connection between the alliterative words. The following are two examples, "He holds him with his skinny hand," in which the "h" sound is being repeated, and "And a good south wind sprung up behind," in which the "s" sound is being repeated.
Internal rhyme is when a rhyme occurs within a single line of verse. Coleridge uses this device frequently in The Rime of the Ancient Mariner. Some examples are,
"The guests are met, the feast is set" (Line 7).
"The ship was cheered, the harbor cleared" (Line 20).
"And he shone bright, and on the right" (Line 26).
"The Wedding Guest here beat his breast" (Line 30).
In each of these examples, there is a word in the middle of the line which rhymes with the word at the end. In the first quote, "met" rhymes with "set", in the second, "cheered" rhymes with "cleared", in the third, "bright" rhymes with "right", and in the last, "Guest" rhymes with "breast".
Alliteration is when the initial sound of a word is repeated in two or more words in a single line or phrase. In Lines 32 - 35 of The Rime of the Ancient Mariner there are two examples of alliteration. The lines read,
"The bride hath paced into the hall,
Red as a rose is she,
Nodding their heads before her goes
The merry minstrelsy".
"Red" and "rose" form an example of alliteration in the second line, and "merry" and "minstrelsy" in the last.
Lines 100 - 104 provide more examples of alliteration. These lines read,
"The fair breeze blew, the white foam flew,
The furrow followed free:
We were the first that ever burst,
Into that silent sea".
The author uses alliteration in this verse with the words "fair", "foam", "flew", "furrow", "followed", "free", and "first". In the last line, "silent" and "sea" are another example of alliteration.