What are different types of keywords in SEO?

1. Seed Keyword - a seed keyword is a one-word keyword that is a noun or entity. An example would be "Plumber".
2. Variant Keyword - a variant keyword is a keyword that uses a different suffix or prefix but is still related to a seed keyword. An example would be "Plumbing"
3. Adjective Based Keyword - an adjective-based keyword is a keyword that pairs with an adjective. An example would be "Best Plumber"
4. Interrogative Based Keyword - an interrogative-based keyword is a keyword that pairs with an interrogative (who, what, when, where, why, and how). An example would be "How to be a plumber"
5. Location-Based Keyword - A location-based keyword is a keyword that pairs with a location. An example would be "Tucson Plumber"

You will often hear SEO's also talk about the keyword "Modifiers". This is an umbrella term for any word that helps modify the head-noun or entity of a keyword. It can be a location, colors, size, and so forth. Also, you will hear SEOs also talk about "Long tail keywords". This again is an umbrella term for any phrase that contains a keyword, paired with adjectives, interrogatives, locations, and so forth. Lastly, power keywords, energy keywords, or anything of the sort is made up nonsense. Keywords pertaining to how we use speech, not what someone has made up to sell you on.