der Samstagmorgen
Saturday morning
The period of time on Saturday morning, usually from getting up until noon.
An einem gemütlichen Samstagmorgen lese ich gerne Zeitung im Bett.
On a cozy Saturday morning, I like to read the newspaper in bed.

Saturday morning
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Saturday morning
The period of time on Saturday morning, usually from getting up until noon.
An einem gemütlichen Samstagmorgen lese ich gerne Zeitung im Bett.
On a cozy Saturday morning, I like to read the newspaper in bed.

This word is made up of 'der Samstag' (Saturday) and 'der Morgen' (morning). The 's' in the middle is a linking s, which connects the two parts of the word.
Wir planen einen Ausflug für den nächsten Samstagmorgen.
We are planning a trip for next Saturday morning.
The form 'samstagmorgens' (written in lowercase) is used as an adverb and means 'every Saturday morning' or 'on Saturday mornings'. This structure also works for other days of the week and times of day.
Samstagmorgens gehe ich immer auf den Markt.
On Saturday mornings, I always go to the market.
To refer to a specific Saturday morning, the preposition 'an' is used with the dative. The usual form is the contraction 'am' (an dem).
Am Samstagmorgen frühstücken wir immer ausgiebig.
On Saturday morning, we always have a big breakfast.
Saturday evening
'der Samstagabend' and 'der Samstagmorgen' both refer to a time on Saturday, but they are at opposite parts of the day. 'Samstagmorgen' is the time after getting up until around noon. 'Samstagabend' is the later time from late afternoon or evening into the night. So the difference is simply the time of day. When talking about breakfast, shopping, or early appointments, 'Samstagmorgen' usually fits. For get-togethers, parties, or dinner, 'Samstagabend' fits.

Der Samstagmorgen ist für den Arzttermin noch frei.
Saturday morning is still free for the doctor's appointment.
Am Samstagabend haben wir nach dem Gespräch noch lange Musik gehört.
On Saturday evening, we listened to music for a long time after the conversation.