Correct spelling, explanation: both presumptive and presumed are correct, but they have slightly different meanings and are used in different contexts. Presumptive is typically used to describe something that is based on presumption, assumption, or likelihood. It often implies a preliminary or provisional status, indicating that something is presumed to be true or likely to happen, but has not been confirmed or established definitively. Presumed is used to describe something that is believed to be true or accepted as true without conclusive evidence or proof. It implies a stronger sense of certainty or belief compared to presumptive, suggesting that something is accepted or taken for granted as true.

Definition of presumptive:
Adjective, believed to be something, or likely to be true, based on the information that you have
The party’s presumptive candidate for the upcoming election has already begun outlining their policy platform.
Following the initial investigation, the fire department declared the cause of the blaze to be electrical, but further analysis is required to confirm the presumptive conclusion.

Collocations with presumptive:
Some of the most commonly used collocations include:
1. Presumptive nominee: refers to a person who is widely expected or assumed to be chosen as the nominee for a particular position, such as a political party’s candidate for an election.
The party’s presumptive nominee for the presidential election has already begun campaigning across the country.
2. Presumptive diagnosis: indicates a diagnosis made based on preliminary signs, symptoms, or test results, before further confirmatory tests or examinations are conducted.
The doctor provided a presumptive diagnosis of pneumonia based on the patient’s symptoms and chest X-ray results.
3. Presumptive evidence: refers to evidence that is considered to be indicative or suggestive of a particular conclusion but is not conclusive on its own.
The fingerprints found at the crime scene were presumptive evidence linking the suspect to the burglary.
4. Presumptive heir: describes a person who is assumed or expected to inherit a particular position, title, or property based on tradition, succession laws, or other factors.
The king’s eldest son was the presumptive heir to the throne until a dispute over succession arose.

Correct spelling, explanation: presumed and presumptive are related terms, but they have slightly different meanings and contexts of usage. Presumed is the past tense or past participle form of the verb presume. It indicates that something is believed to be true or accepted as true without conclusive evidence or proof. Presumptive is an adjective derived from the noun presumption. It refers to something that is based on presumption, assumption, or likelihood. While there may be instances where the two terms can be used somewhat interchangeably, especially in informal or colloquial language, they are not entirely synonymous.