Telegraphic speech is speech during the two-word stage of language acquisition, consisting of commands or imperatives given in three-or-more word sentences consisting of functional words only. A sentence like "treat, bring now" contains enough to make the message effective, if not particularly precise.

A cranberry morpheme is a type of morpheme (the smallest meaningful unit of language) which has no independent meaning or function, but which still serves to distinguish one word from another. In this case, progeny contains the the cranberry morpheme '-geny', an obsolete term designating offspring which is also found in exogeny and endogeny.

A cranberry morpheme is a type of morpheme (the smallest meaningful unit of language) which has no independent meaning or function, but which still serves to distinguish one word from another. In this case, the term hinterland contains the German word hinter ("behind"), paired with the free morpheme '-land'.

Null morphemes are theorized to be those morpheme strings which, while possessing no identifying characteristics, nonetheless allow us to differentiate between different forms of a word. Morphologists propose various theories for how these null morphemes may exist and whether or not we learn them naturally as part of the process of language acquisition.

"Phonemes" are the smallest unit of language that create sound; however, "morphemes" are the smallest units that carry a meaning.

An allomorph occurs when a morpheme varies in pronunciation but not in meaning. For example, the pluralizing morpheme "s/es" in English sounds like "z" in bubbles, but like "s" in cats. Recognition of these allomorphs is often much more difficult for non-native speakers of a language.

An allomorph occurs when a morpheme varies in pronunciation but not in meaning. For example, the pluralizing morpheme "ed" sounds like a "schwa" in wasted but like "t" in wished.

Derivational morphemes change either the semantic meaning or the part of speech to which the base word belongs. For example, in the word atypical the derivational morpheme a- reverses the meaning of the word typical to mean "not typical". The usage of the morpheme -er to change "wise" to "wiser", on the other hand, is inflectional only, as it only changes the comparative state of the associated adjective wise.

Inflectional morphemes are morphemes which modify either a noun/pronoun/adjective's number, gender, or case, or a verb's tense, mood, number, person or aspect, but do not chance the word's overall meaning or the part of speech to which the word belongs. The morpheme -ty at the end of the word cruel changes the word from an adjective to a noun, and is thus an example of a derivational morpheme.

Non-fluent aphasia, such as Broca's aphasia, is often triggered by damage due to stroke or other cardiovascular problem, and often produces the short, morpheme-absent language typical of telegraphic speech.