Answer

If you meant “arihant” and “arhat,” there is usually no doctrinal difference in Jainism. Both terms refer to the same exalted soul who has destroyed the four ghati karmas and attained keval-jnan; Jain sources also use Arhat as another name for Arihant. ( jaina.org)

Explanation

The difference is mainly linguistic:

• Arihant is the form most commonly used in Jain prayers and Jain explanations.
• Arhat is the Sanskrit form/variant found in some texts.
• Arhant is also seen as a spelling variant in Jain literature. So the meaning is essentially the same, not a different spiritual category. ( jaina.org)

Spiritual Understanding

In Jain Dharma, an Arihant/Arhat is a living, omniscient being who has removed the karmas that cover the soul’s true nature. After nirvana, that soul is called a Siddha. This is why Arihant is so highly revered in the Namokar Mantra. ( jaina.org)

Takeaway

So, in simple words: Arihant = Arhat in Jain usage. The difference is mostly spelling and language, not meaning. ( jaina.org)