Final answer:
The term for a poem with two lines that rhyme or all lines with the same end rhyme is a couplet, often used in Shakespeare's works and 17th-18th century poetry such as Alexander Pope's heroic couplets.
Step-by-step explanation:
The term that refers to a poem with every two lines having an identical rhyme or all lines with the same end rhyme is a couplet. A couplet consists of two adjoining lines of poetry which share an end rhyme. A famous example of a couplet is found at the end of Shakespeare's Sonnet 18:
So long as men can breathe or eyes can see, (13)
So long lives this, and this gives life to thee. (14)
Couplets were also prominent in the work of poets like Alexander Pope during the 17th and 18th centuries. Pope's "Essay of Criticism" is written entirely in rhyming couplets, known as heroic couplets, which contribute to a formal and regular quality to the verse.