When scanning poems for rhyme and other literary or poetic devices, be sure to have a clear understanding in your head of what each device means. For example, "connotation" refers to the body of ideas and images that are suggested by the use of a word. In "Annabel Lee," Poe uses the phrase "winged seraphs" to describe the angels who "coveted" the love between the speaker and his lover. Angels connote innocence and purity and "coveted" suggests the sin of jealousy. So, the connotations in this line of "Annabel Lee" make the reader feel that the love between the speaker and his lover was ever pure and in great danger.
Use a guide for literary terms to find the definitions of terms that you need to know and then use strategies for scanning to find examples in Poe's (and other) poems.