What is a part of speech specialty?

It seems like you're asking about a specific term related to the parts of speech in grammar. However, "part of speech specialty" isn't a standard grammatical term. There are a few possibilities depending on what you're interested in:

1. A specific area of expertise within the study of parts of speech: This could be related to:

* Historical linguistics: Studying how parts of speech have evolved over time.

* Comparative linguistics: Comparing parts of speech across different languages.

* Computational linguistics: Using computers to analyze and categorize parts of speech in large amounts of text.

* Teaching grammar: Focusing on how to teach students to identify and use different parts of speech effectively.

2. A specific part of speech that someone is particularly skilled at using: For example, someone might be a "master of adjectives" or have a "talent for using adverbs."

3. A unique characteristic of a specific part of speech: For example, some might say that nouns have a "speciality" in being the core of a sentence, while verbs have a "speciality" in expressing actions or states of being.

To help me understand what you're looking for, can you please provide more context?

For example, you could say:

* "What is a specialty of adjectives?"

* "Is there a particular part of speech that is considered a 'specialty' for certain writers?"

* "Are there any 'parts of speech specialties' that are particularly challenging for English learners?"

Once I have more context, I can give you a more accurate and helpful response.