Keyword – Definition
Within the context of Search Engine Optimization (SEO) and Search Engine Marketing (SEM), a keyword is a term that is selected for use on a website because it is expected to match the term used to search for related information.A keyphrase is a group of keywords that are used as a string.Keyword – Examples
Here are examples of keywords and keyphrases for professional practices:

• Keywords and keyphrases for an Toronto based architect that specializes in residential architecture would include: ‘architect Toronto’ or ‘residential architect Toronto’.
• Keywords and keyphrases for a landscape architect specialized in parks, but not limited to any specific geographic location, would include: ‘landscape architect park design’ or ‘park landscape design’.

Related articles: Choosing Keywords for Your Website, How to Write Optimized Copy for Robots and Humans, Keyword Stuffing – Don’t Do It and Search Engine Optimization (SEO).