Scan vs Scard - What's the difference?

In obsolete terms the difference between scan and scard

is that scan is to mount by steps; to go through with step by step while scard is a shard or fragment.

is that scan is an instance of scanning while scard is a shard or fragment.

is to examine sequentially, part by part.

(scann)

To examine sequentially, part by part.

(computing) To create a digital copy of an image using a scanner.

To look about for.

He scanned the horizon.

(poetry) To fit or conform to a specific meter.

(obsolete) To mount by steps; to go through with step by step.

(en noun)

An instance of scanning.

The operators vacated the room during the scan .

The result or output of a scanning process.

The doctors looked at the scans and made a diagnosis.

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(en noun)

(obsolete) A shard or fragment.

(Webster 1913)