http://www.dailywritingtips.com/types-of-rhyme/
Slant Rhymes (sometimes called imperfect, partial, near, oblique, off etc.)
Rhyme in which two words share just a vowel sound (assonance – e.g. “heart” and “star”) or in which they share just a consonant sound (consonance – e.g. “milk” and “walk”). Slant rhyme is a technique perhaps more in tune with the uncertainties of the modern age than strong rhyme. The following example is also from Seamus Heaney’s “Digging” :
Between my finger and my thumb
The squat pen rests; snug as a gun
Eye Rhymes
Rhyme on words that look the same but which are actually pronounced differently – for example “bough” and “rough”. The opening four lines of Shakespeare’s Sonnet 18, for example, go :
Shall I compare thee to a summer’s day?
Thou art more lovely and more temperate:
Rough winds do shake the darling buds of May,
And summer’s lease hath all too short a date:
Here, “temperate” and “date” look as though they rhyme, but few readers would pronounce “temperate” so that they did. Beware that pronunciations can drift over time and that rhymes can end up as eye rhymes when they were originally full (and vice versa).
How my heart sings 