I prefer Roget's Thesaurus. There are many different forms that poetry can be written in, but I just covered the most popular types here. Iambic pentameter is one of the most popular types of meter. This is a poem that uses ten syllable lines in stanzas of four usually. A form of poetry that is similar to this is a sonnet.
Sonnets have a specific rhyme pattern, though.
A Shakespearean Sonnet is a structured poem consisting of fourteen lines arranged in three quatrains that are four-line stanzas, ending with a rhyming couplet. Each line of the sonnet is composed in iambic pentameter. Free verse is a poem that has no form. There is not a specific number of syllables or any rhyme. These poems almost appear at a first glance like short pieces of prose.