What's the difference between acerval and acervate?

Acerval

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Definition:

• (a.) Pertaining to a heap.

Example Sentences:

• (1) Forty cases of a distinctive acervate epidermal tumour (intra-epidermal epithelioma of Jadassohn) are described.

Acervate

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Definition:

• (v. t.) To heap up.
• (a.) Heaped, or growing in heaps, or closely compacted clusters.

Example Sentences:

• (1) Forty cases of a distinctive acervate epidermal tumour (intra-epidermal epithelioma of Jadassohn) are described.