Old Irish lemmas, categorized by their part of speech.

• Category:Old Irish adjectives: Old Irish terms that give attributes to nouns, extending their definitions.
• Category:Old Irish adverbs: Old Irish terms that modify clauses, sentences and phrases directly.
• Category:Old Irish conjunctions: Old Irish terms that connect words, phrases or clauses together.
• Category:Old Irish determiners: Old Irish terms that narrow down, within the conversational context, the referent of the following noun.
• Category:Old Irish interjections: Old Irish terms that express emotions, sounds, etc. as exclamations.
• Category:Old Irish morphemes: Old Irish word-elements used to form full words.
• Category:Old Irish multiword terms: Old Irish lemmas that are a combination of multiple words, including idiomatic combinations.
• Category:Old Irish nouns: Old Irish terms that indicate people, beings, things, places, phenomena, qualities or ideas.
• Category:Old Irish numerals: Old Irish terms that quantify nouns.
• Category:Old Irish particles: Old Irish terms that do not belong to any of the inflected grammatical word classes, often lacking their own grammatical functions and forming other parts of speech or expressing the relationship between clauses.
• Category:Old Irish phrases: Old Irish groups of words elaborated to express ideas, not necessarily phrases in the grammatical sense.
• Category:Old Irish prepositions: Old Irish adpositions that are placed before their objects.
• Category:Old Irish pronouns: Old Irish terms that refer to and substitute nouns.
• Category:Old Irish verbs: Old Irish terms that indicate actions, occurrences or states.