der Ruin
ruin
The complete financial, economic, or even social collapse of a person, company, or institution.
Die riskanten Spekulationen haben das Unternehmen in den Ruin getrieben.
The risky speculation drove the company into ruin.

ruin
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ruin
The complete financial, economic, or even social collapse of a person, company, or institution.
Die riskanten Spekulationen haben das Unternehmen in den Ruin getrieben.
The risky speculation drove the company into ruin.

'Der Ruin' belongs to the word family of 'ruinieren' (to ruin/destroy) and 'die Ruine' (a ruined building). All the words share the basic meaning of destruction and decay.
Die schlechte Ernte hat viele Bauern ruiniert.
The poor harvest ruined many farmers.
The word 'Ruin' is very strong and expresses a final, total collapse. It is often used to describe a dramatic or very serious situation.
Der Betrug bedeutete den Ruin seines guten Rufs.
The fraud meant the ruin of his good reputation.
In a financial context, 'Ruin' is often used in fixed expressions. Very common are 'jemanden/etwas in den Ruin treiben' (to drive someone/something into ruin) and 'vor dem Ruin stehen' (to be on the brink of ruin).
Seine Spielsucht hat ihn fast in den Ruin getrieben.
His gambling addiction nearly drove him into ruin.
When it is about personal or health-related destruction, 'Ruin' is often used with a genitive attribute or a possessive adjective. It then describes the cause or the result of a negative process.
Die jahrelange harte Arbeit war der Ruin seiner Ehe.
The years of hard work were the ruin of his marriage.
grave
'das Grab' and 'der Ruin' can both speak figuratively about the end or failure of something. 'das Grab' sounds like a place where something disappears or goes under for good. 'der Ruin' more strongly means complete collapse, often financially, economically, or also personally. If a plan 'sein Grab findet' (finds its grave), it is at an end. If someone 'in den Ruin' gerät (falls into ruin), they lose a great deal, for example money, health, or their livelihood. 'Ruin' is therefore more precise when the topic is serious damage or collapse.

Die hohen Schulden brachten das kleine Geschäft in den Ruin.
The high debts brought the small business to ruin.
Zu viele Fehler wurden zum Grab des Projekts.
Too many mistakes became the grave of the project.