The English term "acronym" is differently defined by different linguists, leading to misunderstanding in nomenclature. The first group of writers such as: Quirk et al. (1972: 1031) and Yule ( 1996: 68) argues that acronyms are words either formed from the initial letters of a set of other words; these can be 'alphabetisim' such as 'CD' 'Compact Disk' or 'FBI' 'Federal Bureau of Investigation', or acronyms pronounced as single words, as in: 'UNESCO' (United Nations Educational, Scientific and Cultural Organization) with capital letters or 'Laser' (Light wave amplification by stimulated emission of radiation) which is an acronym used by the public. So , it does not need capitals. Another group, however, finds that acronym is only the name of a word created from the first letter of each word in a series of words, to be pronounced as one word as in: (SONAR, created from sound navigation and ranging; NATO, from North Atlantic Treaty Organization and Scuba, from Self- contained under water breathing apparatus Bauer (1983: 237-238), Wikipedia, (2002: 2), Marriam Webster, cited in Berman (2005: 3), Weakley ( 2006: 3), Kasprowicz ( 2010: 2). A distinction should be made between an 'acronym' and an 'abbreviation' since the latter can be defined as a shortened form of a word or phrase used for brevity in place of the whole, consisting of the first few letters, or even first letter only followed by a full stop, e.g. ('Univ.' from University; 'Dep.' From Department; 'Prof.' from professor, etc.) Ghazala ( 1995: 186). Tourneir ( cited in Bankole, 2006: 4) observes that on the level of pronunciation: "abbreviations are pronounced letter by letter, because they do not conform to the morphological phonetical constraints that exist for words" as in: CDU and LFE whereas acronyms are pronounced as words because they correspond to the morphological phonetical model, as in: OPEC. and UNICEF. However, Weakley( 2006: 1-2) and Cherim (2007: ) regard acronym as a special instance of abbreviations by saying: all methods of shortening words or phrases are subsets of abbreviations, and acronym is one of these methods and it is a pronounceable word. Quirk et al. ( 1972: 981) consider acronymy as blending and clipping as a type of minor word formation processes and it is a means of forming new words on the basis of old ones. These minor processes have attained some importance in modern times. So acronyms are a part of morphology which is itself a part of grammar.