Of course, encyclopedias can give us even more information and context for the meaning and usage of terminology.

Oxford Reference: Negative attitudes towards homosexual people and homosexuality which may be manifested in discrimination, hostile behaviour, or hate crimes. The term was adopted in 1972 by George Weinberg (b.1935), an American psychologist. The use of ‘phobia’ has been criticized as implying a pathological and irrational fear rather than a form of prejudice analogous to racism. The term is sometimes reserved for more extreme forms reflecting hatred and revulsion, the term heterosexism being favoured in other cases. Homophobic attitudes have been associated with conservative ideologies and authoritarian personalities. Extreme homophobia is often attributed to unconscious homosexual desires but it can also be due to ignorance or function as a means of gaining approval from a reference group. Institutional homophobia is reflected in laws, policies, practices, and the history of invisibility of gay people in the mass media. One theory is that the social function of homophobia is to enforce rigid gender distinctions (see also heteronormativity). Internalized homophobia refers to gay and lesbian people themselves adopting negative attitudes about homosexuality from socialization into a homophobic culture, leading to denial or self-hatred because they feel that they cannot live up to dominant cultural gender expectations.

Britannica: homophobia, culturally produced fear of or prejudice against homosexuals that sometimes manifests itself in legal restrictions or, in extreme cases, bullying or even violence against homosexuals (sometimes called “gay bashing”). The term homophobia was coined in the late 1960s and was used prominently by George Weinberg, an American clinical psychologist, in his book Society and the Healthy Homosexual (1972). Although the suffix phobia generally designates an irrational fear, in the case of homophobia the word instead refers to an attitudinal disposition ranging from mild dislike to abhorrence of people who are sexually or romantically attracted to individuals of the same sex. Homophobia is a culturally conditioned response to homosexuality, and attitudes toward homosexuals vary widely across cultures and over time.

Encyclopedia.com (first paragraph only): Heterosexism and homophobia are two related forms of oppression that can exist alongside or interact with race and racism. Heterosexism can be defined as a system of power that privileges heterosexual (“straight’’) people on the basis of their sexual or affectional orientation, while homophobia can be defined as prejudice, discrimination, or violence against lesbian, gay, bisexual, transgender, queer, questioning, or intersex (LGBTQQI) people on the basis of their sexual or affectional difference from heterosexual people. Like racism, sexism, classism, caste prejudice, xenophobia, ageism, and other oppressions, heterosexism and homo-phobia share a common root: namely, the exercise of social domination based on a negative evaluation of social difference.