Mantra ( मंत्र) – is a sacred utterance, a syllable orgroup of words believed to have psychological and spiritual powers.
Example – Gayatri Mantra , Om , Shanti Mantra e.t.c
Suktam (सूक्त) – Each Veda is divided into mandala consists of hymns called sukta intended for various rituals. The sukta in turn consist of individual sloka’s (verse)
Example – Nasadiya Sukta, Purusha Sukta , Shree Sukta e.t.c
Stotra (स्तोत्र ) – They are the hymns written to praise the god. Suktam & Stotra both have same purpose to pray to god.
Example – Panchakshara Stotra, Ram Raksha Stotra, Saraswati Stotra e.t.c
Sholka (श्लोक) – A pair of successive lines of verse, typically rhyming and of the same length. Most Hindu scriptures are written in forms of sloka’s. Mahabharata, Ramayana & Upanishads e.t.c
Stuti (स्तुति) – Any prayer offered to god, it can be done by reciting mantra, suktam, stotra, aarti’s, bhajan e.t.c
Example – Laxmi Stuti ,e.t.c