What's the difference between houseleek and liveforever?

Houseleek

Definition:

• (n.) A succulent plant of the genus Sempervivum (S. tectorum), originally a native of subalpine Europe, but now found very generally on old walls and roofs. It is very tenacious of life under drought and heat; -- called also ayegreen.

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Liveforever

Definition:

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