Are there more words like thou thine thy?

You're right, "thou," "thine," and "thy" are all examples of words that are part of the second-person singular pronoun in Old English and Early Modern English. While we don't use them in everyday speech anymore, they do appear in some contexts like:

* Religious texts: The King James Bible, for example, uses these words extensively.

* Shakespearean plays: Shakespeare and other Elizabethan writers used them frequently to distinguish between singular and plural forms of "you."

* Poetry: Some poets use them to evoke a sense of archaic language or to create a specific mood.

Here are some other words that are related to "thou," "thine," and "thy" and were used in Old English and Early Modern English:

Second-person singular pronoun:

* Thee: The object form of "thou" (e.g., "I love thee.")

* Thou art: The second-person singular form of "to be" (e.g., "Thou art my friend.")

Possessive pronouns:

* Thyself: The reflexive form of "thou" (e.g., "Thou art hurting thyself.")

* Thine own: A more emphatic form of "thine" (e.g., "This is thine own book.")

Other related words:

* Ye: The second-person plural pronoun (e.g., "Ye are all welcome.")

* You: The modern-day second-person pronoun, which is used for both singular and plural.

It's worth noting that these words are no longer in common use, so you'll rarely hear them spoken in modern English. They're more likely to be encountered in older texts or in specific literary contexts.