Each major English dictionary has recently chosen the 2023 Word of the Year. Next, you can find links to the articles that explain the winning words in the UK, USA and Australia, the reasons to choose the winners, the shorlists and longlists of candidates etc.
Many dictionaries have chosen words related to Artificial Intelligence and new technologies. The Collins Dictionary, based in Glasgow, has directly chosen "Artificial Intelligence" as the overall 2023 winner and it adds an illustrated shortlist of another 9 neologisms with their definitions. The Cambridge Dictionary has chosen "hallucination" with the meaning "when artificial intelligence hallucinates, it produces false information" and the article explains why their dictionaries are better tools to learn a language than artificial intelligence, among other things. The Merriam-Webster Dictionary has chosen "authentic", in an era of "deepfakes" and "post-truth", when authenticity "is questioned and valued more than ever", according to the Associated Press News.
On the other hand, The Oxford English Dictionary, has chosen "rizz", meaning "charisma" or "charm", similar to the verb "to rizz up", which means "to attract for a sexual encounter" or to chat up and Macquarie Dictionary, in Sydney, has chosen "cozzie livs" a humorous play on "cost of living", among an interesting shortlist of runner-ups in Aussie English.
Most of the articles can be read by B2 students, but, perhaps the Merriam-Webster and Macquarie texts are more suitable for C1 students. You will find fascinating words like:
Collins: bazball, influencing, nepo baby, ultra-processed, canon event, debanking, greedflation, semaglutide , ULEZ.
Cambridge: to spark [a worldwide discussion], natural language processing, to track [changes in the language], trustworthy, to prevent from [happening], accurate, a prompt, a quizz, ephemeral, ghost [work], [voice] cloning.
Merriam-Webster: a lookup, to boost, to delve into [the reasons], to head for, a spike, deeds, a cockney [accent], worthy, a [data] cruncher, to filter out, evergreen, a bevy, a runner-up, EGOT, rizz, kibbutz, to implode, a deadname, an onslaught, to curtail [LGBTQ+ rights], doppelganger, a springboard, to soar, deepfake, a lawsuit, dystopian, covenant, to indict.
OED: to pertain, to rizz up, a prompt, to harness, a prompt engineer, situationship, to blend, to coin [a word], the noughties, swiftie. 
Macquarie: to coin, to resonate, clipped, reminiscent, menty b, locky d, to be joined, settled, blue-sky flood, algospeak, a deluge, to circumvent, surveillance, low-lying, flow, floodwater, cessation, substantial [rainfall], coded, to shadowban, innocuous, generative AI, to touch a nerve, skimpflation, succinct.
Finally, you can listen to the Brian Lehrer Show on WNYC, where Ben Zimmer, a linguist and language columnist from the The Wall Street Journal, discusses the words of the year 2023 with the radio host and some listeners in the segment 2023 as Defined by the Words of the Year, an audio recording (25:32) which is recommended for C2 students without the help of the transcript, or for C1 students with the support of the transcript.
***
A mini-lesson plan for B2+/ C1/ C2 students: To activate some vocabulary through interaction, you can discuss the following questions with your students or mates in English: Which of these words do you like most? Which of these words make you feel uneasy? Do you have your own, 2023 word of the year either in English or in Spanish? Which one and why?
If you want to keep on talking, you can find more questions on the topic "Words" at ESL Discussions.com/Words.
You can also read here about "Goblin Mode", the Oxford Word of the Year 2022.