Kinds of Buddha

In the Pali commentaries, three kinds of buddha are mentioned:
Sammasambuddhas attain buddhahood, then decide to teach others the truth they have discovered. They lead others to awakening by teaching the Dhamma in a time where it has been forgotten. Siddhartha Gautama is considered a sammasambuddha. (See also the List of the 28 Buddhas (all of whom are sammasambuddhas).)
Paccekabuddhas, sometimes called 'silent Buddhas' are similar to sammasambuddhas in that they attain nirvana and acquire many of the same powers as a sammasambuddha, but are unable to teach what they have discovered. They are considered second to the sammasambuddhas in spiritual development. They do ordain others; their admonition is only in reference to good and proper conduct (abhisamācārikasikkhā). In some texts, the paccekabuddhas are described as those who understand the Dhamma through their own efforts, but do not obtain mastery over the 'fruits' (phalesu vasībhāvam).
Savakabuddhas attain nirvana after hearing the teaching of a sammasambuddha (directly or indirectly). The disciple of a sammasambuddha is called a savaka ("hearer" or "follower") or, once enlightened, an arahant. These terms have slightly varied meanings but can all be used to describe the enlightened disciple. Anubuddha is a rarely used term, but is used by the Buddha in the Khuddakapatha to refer to those who become Buddhas after being given instruction. Enlightened disciples attain nirvana and parinirvana as the two types of Buddha do. Arahant is the term most generally used for them, though it is also applicable to Buddhas.
In the Pali Canon itself, the first two are mentioned by the above names, while numerous examples of the third type occur, without that name. There is no mention of types of buddhas, though the word buddha does sometimes appear to be used in a broad sense covering all the above.