There are a lot of aspect to language. The examples of figurative language that Robert Frost uses are "the road" as kind of metaphor for a course not taken in life while the "yellow wood" stands for an autumn light.
The Language used is Metaphor. Metaphor is said to be used in the entire poem and therefore serves as an extended metaphor.
Conclusively, The road in the poem is known to be a metaphor for human life and the path we have to take through it.
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