der Reichtum
wealth
The state of having a lot of money, property, and valuable goods; great fortune.
Er hat seinen Reichtum durch kluge Investitionen erworben.
He acquired his wealth through smart investments.

wealth / abundance
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wealth
The state of having a lot of money, property, and valuable goods; great fortune.
Er hat seinen Reichtum durch kluge Investitionen erworben.
He acquired his wealth through smart investments.

The noun 'Reichtum' (wealth/abundance) is derived from the adjective 'reich' (rich). The ending '-tum' often forms abstract nouns that describe a state or a totality.
Er war ein sehr reicher Mann, aber sein Reichtum machte ihn nicht glücklich.
He was a very rich man, but his wealth did not make him happy.
When 'Reichtum' (wealth) appears without any further complement, it usually means material wealth (money). The construction 'Reichtum an etwas' (abundance/richness of something), on the other hand, clearly points to the figurative meaning of great variety.
Sein einziges Ziel im Leben war es, großen Reichtum zu erlangen.
His only goal in life was to attain great wealth.
In connection with money and possessions, there are fixed expressions such as 'zu Reichtum kommen' (to become wealthy), 'Reichtum anhäufen' (to accumulate wealth), or 'in Reichtum leben' (to live in wealth).
Durch harte Arbeit und etwas Glück ist sie zu großem Reichtum gekommen.
Through hard work and a bit of luck, she became very wealthy.
When 'Reichtum' (abundance/richness) describes an abundance or variety, the preposition 'an' followed by the dative is almost always used. This specifies what the richness consists of.
Das Buch zeichnet sich durch seinen Reichtum an Details aus.
The book is characterized by its wealth of detail.
money
'das Geld' and 'der Reichtum' can both have to do with financial possessions. 'Geld' is more concrete: you can earn it, spend it, save it, or have it in your bank account. 'Reichtum' describes more the state of having a lot of money, property, or valuable things. The words can be confused because a lot of money can lead to wealth. But 'Geld' is the thing itself, while 'Reichtum' is the large amount or the life situation.

Der Reichtum der Familie sieht man an dem großen Haus und den vielen Reisen.
You can see the family's wealth in the large house and the many trips.
Er spart jeden Monat Geld, weil er ein neues Fahrrad kaufen möchte.
He saves money every month because he wants to buy a new bike.